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Contents

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The Pair-formation Displays of the Western Grebe
Gary L. Nuechterlein and Robert W. Storer

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Wintering Biology of Ruby-crowned Kinglets in the Lower Colorado River Valley
Andrew W. Laurenzi, Bertin W. Anderson, and Robert D. Ohmart

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Endocrine Responses of White-crowned Sparrows to Environmental Stress
John C. Wingfield, Jan P. Smith, and Donald S. Farner

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Physiological Preparation for Autumnal Migration in White-crowned Sparrows
Michael C. Moore, Richard S. Donham, and Donald S. Farner

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Seasonal Carcass Composition and Energy Balance of Female Black Ducks in Maine
Kenneth J. Reinecke, Timothy L. Stone, and Ray B. Owen Jr.

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News and Notes
The Condor

Covers

Short Communications

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Time and Activity Budgets of Ospreys Nesting in Northeastern Nova Scotia
Ian Jamieson, Norman Seymour, and Robert P. Bancroft

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Morning Versus Evening Detectability of Southeast Alaskan Birds
Winifred B. Kessler and Kathleen A. Milne